Hybrid tea rose plant named &#39;Delstrifram&#39;

ABSTRACT

A new and distinct variety of Hybrid Tea rose plant is provided which abundantly forms attractive double long lasting clear pink flowers that are striped with dark pink. The new variety is a whole plant mutation of the ‘Delstriro’ variety (U.S. Plant Pat. No. 13,086) which unlike the present variety forms clear red striped with dark red flowers. The growth habit is bushy. The vegetation is semi-vigorous to vigorous and good disease resistance is displayed when grown in a greenhouse. The new plant is well suited for forcing during cut flower production under greenhouse growing conditions.

BOTANICAL/COMMERCIAL CLASSIFICATION

Rosa hybrida/Hybrid Tea Rose Plant

VARIETAL DENOMINATION

cv. ‘Delstrifram’

SUMMARY OF THE INVENTION

The new Rosa hybrida Hybrid Tea rose plant was discovered in a greenhouse at Malicome, France, during 2003, and is a spontaneous mutation of unknown causation of the ‘Delstriro’ variety (U.S. Plant Pat. No. 13,086). Had the new variety of present invention not been discovered and preserved it would have been lost to mankind.

The parent ‘Delstriro’ variety was a spontaneous mutation of unknown causation of the ‘Delego’ variety (U.S. Plant Pat. No. 9,915) that was discovered during 1999 at Hyères, France.

It was found through careful study that the new variety of Hybrid Tea rose plant of the present invention exhibits the following combination of characteristics:

(a) from a physical point of view forms green mature wood, displays a bushy growth habit, and forms attractive double long lasting clear pink flowers that are striped with dark pink, and

(b) from the biological point of view forms semi-vigorous to vigorous vegetation, produces flowers in abundance, exhibits the ability readily to be forced, and is resistant to diseases when grown under greenhouse conditions.

The new variety of the present invention forms medium length relatively straight stems, and rigid and substantially straight peduncles. An excellent ability to be forced under greenhouse conditions has been observed, as has a good vase life for its distinctive striped pink blossoms.

The new variety well meets the needs of the horticultural industry and is particularly well suited for growing in the greenhouse for the production of attractive long-lasting cut flowers which are clear pink striped with dark pink.

The new variety can be readily distinguished from other varieties in view of the combination of characteristics described herein. For instance, the new variety can be readily distinguished from its ‘Delstriro’ variety parent through an examination of the flower coloration. The ‘Delstriro’ variety forms red flowers that the striped with darker red. Also, the ‘Delego’ ancestor forms unstriped red flowers.

The new variety has been found to undergo asexual propagation and can be readily reproduced by conventional routes, such as budding (i.e., eye grafting), the rooting of cuttings, and tissue culture. This asexual reproduction as performed at Malicome, France, has demonstrated that the characteristics of the new variety are stable and are strictly transmissible from one generation to another.

The new variety has been named ‘Delstrifram’.

BRIEF DESCRIPTION OF THE PHOTOGRAPH

The accompanying photograph shows as nearly true as it is reasonably possible to make the same in a color illustration of this character typical specimens of the plant parts of the new variety. The rose plants of the new variety were grown under glass in central France, at Malicorne, France.

FIG. 1—illustrates a specimen of a young shoot;

FIG. 2—illustrates a specimen of a floral bud at the opening of the sepals;

FIG. 3—illustrates a specimen of a floral bud at the opening of the petals;

FIG. 4—illustrates specimens of a flower in the course of opening;

FIG. 5—illustrates a specimen of an open flower—plan view—obverse;

FIG. 6—illustrates a specimen of an open flower plan view—reverse;

FIG. 7—illustrates a specimen of a fully open flower—plan view—obverse;

FIG. 8—illustrates a specimen of a fully open flower—plan view—reverse;

FIG. 9—illustrates a specimen of a floral receptacle showing the arrangement of the stamens and pistils;

FIG. 10—illustrates a specimen of a floral receptacle showing the arrangement of the pistils (stamens and sepals removed);

FIG. 11—illustrates a specimen of a flowering stem;

FIG. 12—illustrates a specimen of a main branch;

FIG. 13—illustrates a specimen of a leaf with three leaflets—plan view—upper surface;

FIG. 14—illustrates a specimen of a leaf with five leaflets—plan view—upper surface;

FIG. 15—illustrates a specimen of a leaf with three leaflets—plan view—under surface; and

FIG. 16—illustrates a specimen of a leaf with five leaflets—plan view—under surface.

DETAILED DESCRIPTION

The chart used in the identification of the colors is that of The Royal Horticultural Society (R.H.S. Colour Chart-2001). The description is based on the observation of plants grown under glass in central France, at Malicorne, France.

-   Class: Hybrid Tea. -   Plant:     -   -   Height.—plants which were pruned to a height of 20 to 30 cm             produce floral stems having a length of approximately 40 to             100 cm, and an average length of approximately 70 cm.         -   Width.—approximately 50 to 60 cm.         -   Habit.—bushy. -   Branches:     -   -   Color.—young shoots: when approximately 20 cm long, exhibit             green coloration, Yellow-Green Group 146D. — floral stems:             Yellow-Green Group 144A to 146B. — mature wood: Yellow-Green             Group 146A.         -   Diameter.—commonly approximately 8 to 11 mm (average 9 mm).         -   Thorns.—configuration: convex on the upper edge and concave             on the under edge. — quantity, length andfrequency: on a             typical floral stem having a length of 70 cm, there commonly             are no thorns on the 30 cm below the bud, for the next 20 cm             no or very few thorns, and for the last 20 cm some thorns             irregularly arranged having lengths of approximately 3 mm to             1 cm and an average length of approximately 56 mm. On a             young shoot having a length of approximately 30 cm, there             commonly are no thorns. — color: on floral stems the             coloration of the thorns is Greyed-Red Group 181A, and on             mature wood the thorns are Greyed-Orange Group 165A and             165B.         -   Leaves.—number: typical for the class and commonly number             approximately 90 to 100. — size: Terminal leaflets commonly             are approximately 60 to 90 mm (average 70 mm) in length and             approximately 40 to 63 mm (average 46 mm) in width. —             stipules: adnate, medium in size, and commonly 30 to 40 mm             (average 35 mm) in length, approximately 7 to 9 mm (average             8 mm) in width at the mid-point, and approximately 18 to 22             mm (average 20 mm) at the distal end.         -   Leaflets.—number: 3, 5, and 7. — shape: rounded to cordate             at the base of the terminal leaflet and convex in cross             section. — serration: present, single, and irregular. —             general appearance: consistent with medium glossiness. —             petiole: commonly bears some prickles (often 1 to 3 per             petiole), and the inner surface is grooved with             non-glandular edges. — petiole color on young shoot:             Greyed-Orange Group 173A with green and bronze coloration. —             petiole color on floral stem: Yellow-Green Group 146A on the             upper surface and Yellow-Green Group 146C on the under             surface. — petiole color on mature wood: Yellow-Green Group             146A on the upper surface and Yellow-Green Group 146C on the             under surface. — petiole length of terminal leaflet:             approximately 16 to 22 mm, approximately 19 mm on average,             with a standard deviation of 0.22 mm. — terminal leaflet             length: approximately 60 to 90 mm, approximately 70 mm on             average, with a standard deviation of 0.67 mm. — terminal             leaflet width: approximately 40 to 63 mm, approximately 46             mm on average, with a standard deviation of 0.41 mm. —             terminal leaflet shape at base: rounded. — leaflet color             ofyoung shoot: Yellow-Green Group 147A with some bronze             coloration on the upper surface and Greyed-Purple Group 183C             with some green coloration on the middle of the under             surface. — leaflet color on floral stem: Green Group 139A on             the upper surface and Yellow-Green Group 147B on the under             surface. — leaflet color of mature wood: Yellow-Green Group             147A on the upper surface, and Yellow-Green Group 147B on             the under surface. — venation: in a typical alternately             arranged pattern, and the coloration commonly is             Yellow-Green Group 151A at the distal end and Greyed- Yellow             Group 160A at the proximal end. -   Inflorescence:     -   -   Number of flowers.—generally one per stem when grown under             forced greenhouse conditions; however, sometimes during             forced culture an axillary eye or eyes below the flower             develop to form 1 or 2 flowers.         -   Peduncle.—erect, stiff, Yellow-Green Group 144A in             coloration with some small hairs, and approximately 85 to             115 mm in length (average approximately 100 mm).         -   Sepals.—configuration: Two sepals commonly possess no             extensions, and three sepals commonly possess medium to             strong extensions. The extensions are denticulate and             commonly are long to very long. The sepal length commonly is             50 to 70 mm (average 60 mm). — color: Yellow-Green Group             147B on the upper surface and Yellow-Green Group 146B on the             under surface.         -   Buds.—shape: ovate in longitudinal section just before the             opening of the sepals. size before calyx breaks: the bud             lengths are approximately 28 to 31 mm, with an average             length of approximately 30 mm. — color as calyx breaks:             Yellow Group 2B striped with Red Group 38C. — size after             calyx breaks: the bud lengths are approximately 38 to 45 mm,             with an average length of approximately 40 mm. — color after             calyx breaks: inside: Orange-Red Group 31A striped with Red             Group 53A.         -   Flower.—time: when growing in the greenhouse in the winter             at a temperature of approximately 16 to 25° C. flowering             occurs in approximately 50 days. — shape: irregularly             rounded when viewed from above. — form: double, flattened             convex at the upper part when viewed from the side, and             flattened convex to convex at the lower part when viewed             from the side. — diameter: medium to large, approximately 10             to 12 cm, and approximately 11 cm on average, with a             standard deviation of 0.5 cm. — petal number: commonly             approximately 31 to 39, and an average of approximately 36.             — petal size (second rowfrom outside): the length is             approximately 55 to 65 mm with a mean of approximately 59             mm, and a standard deviation of 0.4 mm; and the width is             approximately 55 to 69 mm with a mean of approximately 53             mm, and a standard deviation of 6 mm. — petal shape: the             first row of petals commonly exhibits a broad ovate             configuration, the undulation of the petal margins is             average, and the reflexing of the margins is average. —             petal color: the following description of a nearly fully             open flower was made while observing a rose grown in the             greenhouse during October which had been undergoing opening             for three days. — petal color (middle zone): on the inner             surface Red Group 50C striped with Red Group 53C, and on the             outer surface Red Group 50C striped with darker striping of             Red Group 53C. — petal color (marginal zone): on the inner             surface Red Group 50C striped with Red Group 53C, and on the             outer surface Red Group 50C with darker striping of Red             Group 53C. — petal spot at base: small in size, and can be             absent when the plant is grown outdoors. Color ofspot inner             side: Yellow Group 9B. Color of spot outer side:             Green-Yellow Group 1D. — stamens: approximately 136 in             number and are somewhat regularly arranged. — filaments:             medium in length, not all possess an anther, when the flower             is partially open Yellow-Orange Group 14A in coloration, and             when the flower is fully open Red Group 37C and Yellow Group             8B in coloration. — anthers: medium in size, all open at             approximately the same time, and the immature coloration is             Yellow-Orange Group 14C. — pollen: sparse in quantity and             Yellow-Orange Group 21A in coloration. — pistils:             approximately 147 in number. — styles: medium in length and             Red Group 52A in coloration. — stigmas: Yellow-Orange Group             18B, and generally are present at the same level as the             anthers, but a few anthers may be higher. — hips: rarely             formed, in longitudinal section they are in the shape of a             funnel and are approximately 23 mm in diameter. — seeds:             none to date. — petal drop: the petals detach cleanly. —             fragrance: slight. — lasting quality: long. When cut and             placed in a vase, the flowers commonly last approximately 5             to 6 days. -   Development:     -   -   Vegetation.—semi-vigorous to vigorous.         -   Blooming.—very abundant and almost continuous.         -   Aptitude to forcing.—excellent.         -   Resistance to diseases.—good under greenhouse conditions, as             well as when grown outdoors.         -   Winter hardiness.—not determined since the variety is             primarily intended for cut flower production under             greenhouse growing conditions.         -   Drought tolerance.—not determined since the variety has been             tested under standard greenhouse growing conditions with             adequate water to date. 

1. A new and distinct Hybrid Tea Rose plant that exhibits the following combination of characteristics: (a) from a physical point of view forms green mature wood, displays a bushy growth habit, and forms attractive double long lasting clear pink flowers that are striped dark pink, and (b) from a biological point of view forms semi-vigorous to vigorous vegetation, produces flowers in abundance, exhibits the ability readily to be forced, and is resistant to diseases when grown under greenhouse conditions; substantially as illustrated and described. 